photolibrary

问题 I have successfully added metadata to a jpg created within the app and saved it to the Camera Roll using the writeImageToSavedPhotosAlbum: metadata: completionBlock: method. However I would also like the option of emailing this jpg with the metadata (such as location, exit, etc.). I use this to email: MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init]; picker.mailComposeDelegate = self; NSData *myData = UIImageJPEGRepresentation(emailImage, 0.8); [picker

问题 I want to get all of the pictures from photoLibrary. I would prefer a method or example that I can use directly. 回答1: //View Controller header(.h) file.. #import <UIKit/UIKit.h> #include <AssetsLibrary/AssetsLibrary.h> @interface getPhotoLibViewController : UIViewController { ALAssetsLibrary *library; NSArray *imageArray; NSMutableArray *mutableArray; } -(void)allPhotosCollected:(NSArray*)imgArray; @end //implementation file declare global count variable as static int count=0; @implementation

问题 There are three imageViews in first view controller (two donuts png and one Simpson image). Are there any solutions that I can capture these images as one image and save it to photo library? Thanks. 回答1: Try this, passing in the base view that has all the subviews you need: func createImage(from aView:UIView) -> UIImage { UIGraphicsBeginImageContextWithOptions(CGSize(width: aView.frame.width, height: aView.frame.height), true, 0) aView.layer.render(in: UIGraphicsGetCurrentContext()!) let

问题 The following is a crash report I received from my crash reporting service, HockeyApp. The reason for the failure is a failure to save in PLSharedManagedObjectContext. I (think) I am doing all of my saves in the main app delegate managedObjectContext. Why is the PLSharedManagedObjectContext the one being saved to? I think this is the relevant code: -(void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { __ENTERING_METHOD__ DLog(@

问题 How can we use Pictures/RootPictureAlbum/SavedPicture API of MediaLibrary class to access the photos in SavedPicture folder to read them into byte buffer? 回答1: Try by this way using (var library = new MediaLibrary()) { var savedPictures = library.Pictures.ToList(); if (savedPictures.Any()) { foreach (var pic in savedPictures) { var bitmap = new WriteableBitmap(pic.Width, pic.Height); using (var stream = pic.GetImage()) //here you will get the stream { bitmap.SetSource(stream); } } } } 来源：

问题 I'm using matlab in order to perform modifications on an image. I have loaded an image on Matlab. (the image may be in different resolutions) Converted the image to gray scale then converted the image's matrix to double. I have drawn grid lines on the image (I have posted the code how to do that somewhere here on stack over flow). My problem is that I may have upon the 1000 squares as a result from girding the image on the X axis and the Y axis. I'd like to numbering the squares in that image

问题 I can write photos to camera roll, but how can I delete one? I remember a couple years ago someone said it is impossible, but I believe I have seen an app recently that did it. 回答1: To delete photo from camera roll is not possible from application. Apple has never given access of delete photo of camera roll from application. 回答2: This is now possible (since iOS 8). Hopefully this helps other folks who end up here from Google. To do this, check out the deleteAssets method of the

问题 Hi I am trying to save a downloaded mp4 file to my gallery. Downloading the url by using , downloadTask in func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL){ } I am getting the url file:///private/var/mobile/Containers/Data/Application/8D761DFE-C050-426D-B91C-61DE441FB496/Library/Caches/com.apple.nsurlsessiond/Downloads/com.te.dn/CFNetworkDownload_KFSYSW.tmp I am creating a path by using, let path =

问题 I'm on Swift 3, iOS 10.3, and Xcode 8.3.3. When I access the photo library on the simulator the UIImagePicker is presented with no problem and I can pick photos. As soon as I try to access the photo library on an actual device (iPhone 7+) the app crashes because the UIImagePicker won't get presented (I don't even get to the point to pick a photo). The odd thing is on an actual device the imagePicker presents the camera and I can take photos with no problem. Even though I didn't add it inside

问题 I have a storyboard where I created a UINavigationController instance and set its custom class to UIImagePickerController . If I set imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera in prepareForSegue , everything works fine. If I set imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary in prepareForSegue , I get a mostly black screen with an empty gray bar on top that I can't dismiss: [future location of screenshot - I cannot post images] I can work around